TiO_2/α-Fe_2O_3和TiO_2/α-FeOOH纳米复合材料的制备与表征  

Preparation and Characterization of TiO_2/α-Fe_2O_3 and TiO_2/α-FeOOH Nanocomposite

作　　者：梁凯[1] 唐丽永[2] 李国华[3] 

机构地区：[1]韶关学院环境工程系,韶关512005 [2]江苏大学材料科学与工程学院,镇江212013 [3]浙江工业大学绿色化学合成技术国家重点实验室培育基地,杭州310032

出　　处：《人工晶体学报》2011年第4期1011-1016,共6页Journal of Synthetic Crystals

基　　金：浙江省自然科学基金(Y406094和Y4080209);浙江省科技计划资助项目(2007F70039)

摘　　要：以TiCl4为前驱体,α-Fe2O3、α-FeOOH为载体,采用水解沉淀法制备TiO2/α-Fe2O3和TiO2/α-FeOOH两种纳米复合光催化材料。采用X射线衍射分析(XRD)和透射电子显微镜(TEM)等对样品的晶相组成、形貌和微结构进行表征。结果表明,TiO2/α-Fe2O3复合材料由赤铁矿和金红石相TiO2组成;TiO2/α-FeOOH复合材料由水合氧化铁和金红石相TiO2组成。TiO2/α-Fe2O3复合材料中颗粒状TiO2能包覆在粒状氧化铁红表面,形成厚度范围在5～20 nm左右的薄层;TiO2/α-FeOOH复合材料是一种核壳结构,厚度范围在100～150 nm的针状TiO2聚集体为壳,能完整的包覆核层氧化铁黄。采用UV-vis光谱和甲基橙降解对其光催化活性进行评价,结果表明纳米TiO2与α-Fe2O3、α-FeOOH分别构成复合材料后,两者之间存在协同效应。TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposite were fabricated by a hydrolysis-precipitation approach,using TiCl4 as precursor,α-Fe2O3 and α-FeOOH as supports.The crystal phase,diameter of crystallite and morphology of the samples were characterized by X-ray diffraction（XRD）,transmission electron microscope（TEM）.The results indicated that the crystal phases of TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposites were composed of α-Fe2O3 and rutile,α-FeOOH and anatase,respectively;Granular titania particles form a thin layer with a thickness of 5-20 nm on the surface of α-Fe2O3,and act as a shell on the surface of α-Fe2O3.TiO2/α-FeOOH is a kind of core-shell structure too,needle-like TiO2 particles aggregate around α-FeOOH core,and act as a shell with a thickness of 100-150 nm on the surface of α-FeOOH.The photocatalytic activity of the samples were evaluated by UV-vis spectrum and photo-degradation of MO under tungsten lamp irradiation.The results indicated that a synergistic effect existes between α-Fe2O3,α-FeOOH and TiO2 in the nanocomposite.

关 键 词：TiO2 氧化铁 纳米复合材料 光催化活性 

分 类 号：O643[理学—物理化学] TB332[理学—化学]